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الفصل 25
تكوّن الحيوانات المنوية
Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim…
تكوّن البويضات
In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways…
التخصيب
During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from…
الانقسام والتأريم
After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube.…
تكوّن المُعَيدة
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series…
تكوّن الأنبوب العصبي
Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the…
هجرة الخلايا
Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms…
التحديد
During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination.…
المجهر من دورة حياة الجنسية الانشطار الخميرة
The fission yeast Schizosaccharomyces pombe has been an invaluable model system in studying the regulation of the mitotic cell cycle progression, the…
تحليل فصل الكروموسوم، هيستون أستيلاتيون، و مورفولوجيا المغزل في البويضات الحصان
The field of assisted reproduction has been developed to treat infertility in women, companion animals, and endangered species. In the horse,…

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